Interestingly it was specifically leftist thinkers and personalities who have been against globalization as promoted by free-market capitalism. That might seems shocking in light of recent election rhetoric.
https://chomsky.info/secrets03/
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About half of what are called US exports to Mexico are intrafirm transfers of this sort. They don’t enter the Mexican market, and there’s no meaningful sense in which they’re exports to Mexico. Still, that’s called "trade."
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This interview by Sanders on Vox is also very illustrative:
https://www.youtube.com/watch?v=S5vOKKMipSA&t=352
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Bernie Sanders: Open borders? No, that's a Koch brothers proposal.
Ezra Klein: Really?
Bernie Sanders: Of course. That's a right-wing proposal, which says essentially there is no United States. ...
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It is sad really. People keep calling those who voted and promoted Hillary "the left" but there is not much "left" left in there. Trump apparently took the traditional bread-and-butter leftist issues NAFTA and jobs and ran with it. Whether he cares for those things or not, at least he picked them up. So the Democrats ended up with identity politics, mixed with corporatism. They are trying to appeal to Occupy Wall St. and also give $200k speeches to Wall St., they are for gay rights but also take donations from states which throw gays off of buildings. It was rather upsetting when during the nightclub shooting in Orlando, Hillary's campaign and the rest of the media moved quickly to suppress the news because it involved a what apparently an Islamic Terrorist attack. I know a few gay people who never quite got over that and never forgot it...
Moreover on identity politics and the left. Has Marx never wrote anything about labeling groups correctly so they don't get offended? It was always about being very offended, specifically offending the ownership class and not just offending them, but annihilating them.
Maybe one good thing about Trump winning is that it cleared the table for creation of a new political party. A more authentic left party. Those people who followed Sanders what happened to them? There such tremendous energy there. Is it wasted on boycotting Uber, and re-tweeting the same things over and over... I am afraid it is.